Improvement in double force-pumps



n. HULBEM, 3. r. a H. WQN-AsrL noULE FORCE PUMP.

MISTER, FHOT0 UTHDGRIFHER WASHINGTON. D. C.

U'rrnn Srrns rrron,

PATENT HIRAM HULBERT, BENJAMN F. NASH, AND HARVEY W. NASH, OF.

PLYMOUTH, WISCONSIN.

IMPROVEMENT IN DOUBLE FORCE-PUMPS.

Specification forming part of Letters Patent No. 183,500, dated October24, 1876; application filed July 11, 1876.

To all whom it may concern:

Be it known that we, HIRAM HULBERT, BENJ. F.NAsH, and HARVEY W. NASH,all of the town of Plymouth, in the county of Sheboygan and State ofWisconsin, have invented certain Improvements in Double-ActingForce-Pumps, of which the following is a specication:

Our invention relates to any pumps where force is used to raise orinject air or water.

The invention consists in an outside perforated valved cylinder, intowhich a piston works, as shown. An inner cylinder or piston-head workswithin the outer or main cylinder, and it is operated by a piston-rod,connected to a steam-engine or other motive power. The inner cylinder isprovided with suitable perforations, each governed by an independentvalve opening inward. The piston-rod is hollow, and is perforatedmore orless, within the chamber ofthe inner cylinder. These perforations may,as is obvious, be controlled by the exigencies of the purpose to whichthe invention may be diverted.

We are aware of the patent of H. M. Stoker, No. 48,219, of June 13,1865, and also of the patent to O. A., Clarke, No. 32,048,

April 16, 1861; and the present invention is.

an improvement thereon.

We have discovered that in many cases it is necessary to use adouble-acting pump in places where the shallowness of the water will notadmit of the reciprocation of a cylinder, whether it be large orcomparatively small. We have also discovered that it is desirable toreduce the size of the cylinder as much as possible, in order to makethe invention especially effective in shallow water without disturbingthe walls of the cistern, well, &c., and without muddying the water fromexcessive irritation, agitation, Snc.

We will now describe what we consider the best means of carrying out ourinvention.

The outer cylinder in our invention may be made as small as ten (l0)inches in height. It is apparent that such a construction would beespecially effective in certain cases,

The drawing represents a vertical section of our invention. .Referringthereto, A is the cylinder, cast in one or more pieces, or made A ofboiler-iron, made water-tight in any suitable manner. The'upper andlower surfaces are perforated at a a', and opening inward from suchperforations are valves, so hinged as to be susceptible to `the actionof the slightest pressure. B is an inner cylinder or piston-head, havinga chamber inside, perforated in two or more places, b b', upon bothupper and under surfaces thereof, each perforation of which iscontrolled by an independent valve opening inward. C is a hollowpiston-rod, passing through suitable packing into the cylinder A, andinto the inner cylinder B. It may extend entirely through the same intothe lower plate thereof, and be perforated, as desired, between theupper and lower plates, or it may terminate at the upper plate, openinginto the inner chamber. c 0 are the perforations, as shown.

The upper and lower plates of the inner cylinder approach nearly to theinner surface of the outer cylinder, and between these two suitablepacking may be introduced.

It being understood that the entire outer cylinder is submerged, ltheoperation of our invention isas follows: The descent of the piston-rod(l creates a partial vacuum in the upper portion of the outer cylinderA, and consequently opens the valve at a, through which the waterenters. The return movement'of the piston-rod closes the valve at a andopens .the valve b in the inner cylinder B,.from whence the water passesthrough c into the hollow piston-rod C, and is ejected, as desired. Theoperation thereafter is ob- .vious.

We are aware that a reciprocating perforated valved cylinder has beenbefore used in connection with a stationary hollow piston and a solidannular valve, but such a construction requires great depth vof water,tends to muddy the water, and is inoperative in general low-water wellsand cisterns..

Our invention is adapted for use in shallow water without materialdisturbance, and is constructed at little cost, and operates efciently.

We are also aware that annular valves, made in one piecelto coverseveral apertures, have been before used, but these fail in practiee tooperate eoientlyyas. the friction upon as ourown invention we y,ax our`signatures `either side binds the annular valve, and allows in presenceof two `Witnesses. i

some of the apertures to become inoperative. HIRAM HULERT We `olaim iThe stationary cylinder A, having the valves a a', in combination withthe recipro-` Witnessesh y eating inner `cylinder B,` havingVinlet-aper-l H N KILLSON tures, each aperture being providedNwith-a Y'A"POOL separate @lack-valve, b b', and with the hollow perforatedvpiston-rod G @,as and for the purf; Witnesses forH. NASH: posesspecified. 1 H. CLAY SMITH,

In testimony that We claim" the foregoing THOMAS G. GONNOLLY.

